In the near future, all citizens will wear a centrally-controlled, super iPhone that tracks your movements and can scan everyone around you to divulge their net worth, their shopping history and their dating potential. The so-called äppärät is an invention of Gary Shteyngart, author of the satiric novel “Super Sad True Love Story.” Is there an äppärät in your future? To find out more we caught up with Shteyngart at Newtonville Books, near Boston.